feat: 添加 Commands 系统支持斜杠命令

实现类似 OpenCode 的 Commands 功能：
- 支持 Markdown 格式定义命令，带 YAML frontmatter
- 变量替换：$ARGUMENTS, $1/$2, @filepath, !`shell`
- 三级加载：builtin < user < project
- 7 个内置命令：init, review, test, fix, explain, commit, help
- 集成终端 UI 支持 /commands 列表和命令执行
- 完整单元测试覆盖 (46 tests)

src/index.ts

@@ -4,11 +4,13 @@ import { Command } from 'commander';
 import { Agent } from './core/agent.js';
 import { TerminalUI } from './ui/terminal.js';
 import { loadConfig, initConfig } from './utils/config.js';
-import { toolRegistry, todoManager, initTaskContext, updateTaskDescription } from './tools/index.js';
+import { toolRegistry, todoManager, initTaskContext, updateTaskDescription, updateSkillDescription } from './tools/index.js';
 import { getPermissionManager, promptPermission } from './permission/index.js';
 import { SessionManager } from './session/index.js';
 import { agentRegistry } from './agent/index.js';
 import { initLSP, shutdownLSP } from './lsp/index.js';
+import { getCommandRegistry } from './commands/index.js';
+import { getSkillRegistry } from './skills/index.js';
 import {
   printServerList,
   installServer,
@@ -127,6 +129,15 @@ program.action(async () => {
   initTaskContext(config, sessionManager);
   updateTaskDescription();
 
+  // 初始化 Skill 注册表
+  const skillRegistry = getSkillRegistry();
+  await skillRegistry.initialize(process.cwd());
+  updateSkillDescription();
+
+  // 初始化 Command 注册表
+  const commandRegistry = getCommandRegistry();
+  await commandRegistry.initialize(process.cwd());
+
   // 显示会话恢复信息
   const session = sessionManager.getSession();
   if (session && session.messages.length > 0) {